Put the logic from devstack gate into tox.
Put the logic from devstack gate into tox.

Change-Id: Idb4a5a0b5eeca266603db8737d65120864de1c6a

akash1808/tempest,afaheem88/tempest,tonyli71/tempest,yamt/tempest,zsoltdudas/lis-tempest,Juniper/tempest,afaheem88/tempest_neutron,NexusIS/tempest,vedujoshi/tempest,afaheem88/tempest_neutron,xbezdick/tempest,redhat-cip/tempest,JioCloud/tempest,hpcloud-mon/tempest,neerja28/Tempest,vedujoshi/tempest,tudorvio/tempest,citrix-openstack/build-tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,Tesora/tesora-tempest,Vaidyanath/tempest,citrix-openstack-build/tempest,cisco-openstack/tempest,hayderimran7/tempest,varunarya10/tempest,rzarzynski/tempest,manasi24/tempest,danielmellado/tempest,flyingfish007/tempest,redhat-cip/tempest,masayukig/tempest,cloudbase/lis-tempest,eggmaster/tempest,afaheem88/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,ebagdasa/tempest,xbezdick/tempest,citrix-openstack-build/tempest,armando-migliaccio/tempest,Mirantis/tempest,roopali8/tempest,dkalashnik/tempest,vmahuli/tempest,alinbalutoiu/tempest,neerja28/Tempest,nunogt/tempest,Mirantis/tempest,roopali8/tempest,itskewpie/tempest,pczerkas/tempest,sebrandon1/tempest,rakeshmi/tempest,vedujoshi/os_tempest,LIS/lis-tempest,hayderimran7/tempest,tudorvio/tempest,Lilywei123/tempest,flyingfish007/tempest,vmahuli/tempest,hpcloud-mon/tempest,jamielennox/tempest,tonyli71/tempest,JioCloud/tempest,yamt/tempest,queria/my-tempest,pandeyop/tempest,queria/my-tempest,citrix-openstack/build-tempest,openstack/tempest,Juraci/tempest,sebrandon1/tempest,eggmaster/tempest,CiscoSystems/tempest,akash1808/tempest,openstack/tempest,danielmellado/tempest,CiscoSystems/tempest,manasi24/jiocloud-tempest-qatempest,cloudbase/lis-tempest,bigswitch/tempest,varunarya10/tempest,rzarzynski/tempest,cisco-openstack/tempest,Vaidyanath/tempest,ebagdasa/tempest,itskewpie/tempest,armando-migliaccio/tempest,Tesora/tesora-tempest,jaspreetw/tempest,BeenzSyed/tempest,jamielennox/tempest,Juniper/tempest,alinbalutoiu/tempest,izadorozhna/tempest,izadorozhna/tempest,zsoltdudas/lis-tempest,dkalashnik/tempest,adkerr/tempest,jaspreetw/tempest,masayukig/tempest,pandeyop/tempest,ntymtsiv/tempest,vedujoshi/os_tempest,adkerr/tempest,manasi24/tempest,bigswitch/tempest,Lilywei123/tempest,Juraci/tempest,rakeshmi/tempest,nunogt/tempest,manasi24/jiocloud-tempest-qatempest,BeenzSyed/tempest,NexusIS/tempest,ntymtsiv/tempest,pczerkas/tempest,LIS/lis-tempest